<template>
	<view class="jsonview">
		<view @click="toggleClose" :class="['angle', isShow ? 'closed' : '']" v-if="length"></view>
		<view class="first-line">
			<view v-if="jsonKey" class="json-key">"{{ jsonKey }}":</view>
			<view v-if="length" class="json-fold">{{ prefix }} {{ isShow ? '...' + subfix : '' }}</view>
			<view v-if="!length">{{ isArray ? '[]' : '{}' }}</view>
		</view>
		<view class="json-body" v-if="!isShow && length" v-for="(item, index) in items" :key="index">
			<y-json-view v-if="item.isJSON" :json="item.value" :jsonKey="item.key"
				:isLast="index === items.length - 1"></y-json-view>
			<view class="json-item" v-else>
				<view class="json-index" v-if="isArray">{{ index }}</view>
				<view class="json-key" v-else>{{ '"' + item.key + '"' }}</view>
				<view class="json-colon">
					<view>:</view>
				</view>
				<view class="json-value">{{ item.value + (index === items.length - 1 ? '' : ',') }}</view>
			</view>
		</view>
		<view v-if="!isShow && length" class="last-line">
			<view>{{ subfix }}</view>
		</view>
	</view>
</template>

<script>
	export default {
		name: 'y-json-view',
		props: {
			json: {
				type: [Object, Array],
				default: null
			},
			jsonKey: {
				type: String,
				default: '' //第一个键
			},
			isLast: {
				type: Boolean,
				default: true
			},
			closed: {
				type: Boolean,
				default: false
			}
		},
		mounted() {
			this.isShow = this.closed;
		},
		watch: {
			closed: function() {
				this.isShow = this.closed;
			},
		},
		data() {
			return {
				isShow: true
			};
		},
		methods: {
			isObjectOrArray(source) {
				const type = Object.prototype.toString.call(source);
				const res = type === '[object Array]' || type === '[object Object]';
				return res;
			},
			toggleClose() {
				if (this.isShow) {
					this.isShow = false;
				} else {
					this.isShow = true;
				}
			}
		},
		computed: {
			isArray() {
				return Object.prototype.toString.call(this.json) === '[object Array]';
			},
			length() {
				//返回数组长度或对象的属性个数
				return this.isArray ? this.json.length : Object.keys(this.json).length;
			},
			subfix() {
				return (this.isArray ? ']' : '}') + (this.isLast ? '' : ',');
			},
			prefix() {
				return this.isArray ? '[' : '{';
			},
			items() {
				const json = this.json;
				if (this.isArray) {
					return this.json.map(item => {
						const isJSON = this.isObjectOrArray(item);
						//console.log(item)
						return {
							value: item, // isJSON ? item : JSON.stringify(item),
							isJSON, //相当于isJson:isJson
							key: ''
						};
					});
				} else {
					return Object.keys(json).map(key => {
						const item = json[key];
						const isJSON = this.isObjectOrArray(item);
						return {
							value: item, // isJSON ? item : JSON.stringify(item),
							isJSON,
							key
						};
					});
				}
			}
		}
	};
</script>
<style lang="scss">
	$tab:40upx; //缩进
	$font-size:13px;
	$colon-size:7px; //冒号两边的间隔
	$arrow-size:5px;
	$arrow-color:#333;
	$key-color:#c35e00;
	$index-color:#0000ff;
	$vaule-color:#42c800;

	.jsonview {
		position: relative;
		line-height: $font-size * 1.62;
		font-size: $font-size;
		margin: 0;
		padding-left: $tab;
		white-space: nowrap;
	}

	.first-line {
		display: flex;
		flex-direction: row;
		justify-content: flex-start;
		align-items: center;
		text-align: center;

		.json-key {
			color: $key-color;
		}

		.json-fold {
			display: flex;
			flex-direction: row;
			justify-content: flex-start;
		}
	}

	.json-body {
		position: relative;
		padding: 0;
		margin: 0;
		display: flex;
		flex-direction: row;

		.json-item {
			display: flex;
			flex-direction: row;
			justify-content: flex-start;
			align-items: center;
			text-align: center;
			margin: 0;
			padding-left: $tab;

			.json-index {
				color: $index-color;
			}

			.json-colon {
				padding: 0 $colon-size;
			}

			.json-key {
				color: $key-color;
			}

			.json-value {
				color: $vaule-color;
			}
		}
	}

	.last-line {
		display: flex;
		flex-direction: row;
		padding-left: 0;
	}

	.angle {
		position: absolute;
		display: block;
		left: 0;
		text-align: center;

		&::after {
			content: '';
			display: inline-block;
			width: 0;
			height: 0;
			vertical-align: middle;
			border-style: solid;
			border-color: transparent;
			border-top-color: $arrow-color;
			border-width: $arrow-size;
		}

		&.closed::after {
			border-style: solid;
			border-color: transparent;
			border-left-color: $arrow-color;
			border-width: $arrow-size;
		}

		//}
	}
</style>
